Will not start

Was having a problem with the truck's not starting or not Idling very well. It kept cutting off then wouldn't start. Figured out that it was the camshaft position sensor, so I went ahead and replaced the new distributor, new distributor cap, new rotor button. Put it all back together one minute runs fine next minute I do not have fire on the number one plug coming out of the distributor cap. Even to the spark plug or spark plug wire.